commit https://github.com/vim/vim/commit/17a13437c9414a8693369a97f3be2fc8ad48c12e Author: Bram Moolenaar <Bram@vim.org> Date: Sun Jan 24 14:22:10 2016 +0100 patch 7.4.1163 Problem: Expressions "0 + v:true" and "'' . v:true" cause an error. Solution: Return something sensible when using a special variable as a number or as a string. (suggested by Damien)

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